The DME MS42.1 is an advanced engine control unit used in a wide range of BMW models equipped with the M52TU and early M54 engines. This page provides a clear, structured pinout schematic designed to help technicians, enthusiasts, and diagnostic specialists understand the electrical connections of the MS42.1 ECU.
Our schematic diagram displays all primary ECU pins, including power supply, grounds, sensor inputs, actuator outputs, CAN/K-Line communication lines, and auxiliary functions. Each pin is neatly arranged and labeled for quick identification, making the diagram suitable for troubleshooting, harness repairs, engine swaps, or custom wiring projects.
Whether you are performing diagnostics, retrofitting, or studying BMW engine management systems, this MS42.1 pinout diagram serves as an accurate and easy-to-read reference.
DME MS42.1 Pinout. Schematic Diagram
BMW Z3 (E36/7) Roadster, Coupe (1999)
Engine Control System MS42.1 (6-Cylinder M52 Engine)
Engine Control System MS42.1 (6-Cylinder M52 Engine)
DME MS42.1 Pinout. Schematic Diagram
BMW Z3 (E36/7) Roadster, Coupe (2000)
Engine Control System MS42.1 (6-Cylinder M52 Engine)
Engine Control System MS42.1 (6-Cylinder M52 Engine)
E = Input
A = Output
M = Ground
X60001 (9 Pins)
| Pin | Type | Signal | Description/Function | Connection |
| 1 | A | 15 | Activate relay | Unloader relay terminal 15 |
| 2 | Not used | |||
| 3 | Not used | |||
| 4 | M | 31E | Ground | Ground point |
| 5 | M | 31L | Ground | Ground point |
| 6 | M | 31L | Ground | Ground point |
| 7 | E | 30 | Voltage supply | B+ junction point E-box |
| 8 | E | U_HR<2 | Voltage supply | Fuse holder in E-box |
| 9 | E | U_HR<2 | Voltage supply | Fuse holder in E-box |
X60002 (24 Pins)
| Pin | Type | Signal | Description/Function | Connection |
| 1 | M | T_LHV1 | Oxygen sensor heating ground | Oxygen sensor 1 (in front of catalytic converter) |
| 2 | Not used | |||
| 3 | E/A | D_CAN-L | CAN bus low | Transmission control module (EGS) |
| 4 | E/A | D_CAN-H | CAN bus high | Transmission control module (EGS) |
| 5 | Not used | |||
| 6 | E/A | D_TXD2 | Diagnosis | Transmission control module (EGS) |
| 7 | M | T_LHH1 | Oxygen sensor heating ground | Oxygen sensor 1 (behind catalytic converter) |
| 8 | Not used |
| Pin | Type | Signal | Description/Function | Connection |
| 9 | Not used | |||
| 10 | Not used | |||
| 11 | Not used | |||
| 12 | A | S_KKU | Activate valve | Solenoid valve (Running Losses) |
| 13 | M | T_LHV2 | Oxygen sensor heating ground | Oxygen sensor 2 (in front of catalytic converter) |
| 14 | E | A_LSV1 | Sensor signal | Oxygen sensor 1 (in front of catalytic converter) |
| 15 | E | A_LSV2 | Sensor signal | Oxygen sensor 2 (in front of catalytic converter) |
| 16 | E | A_LSH1 | Sensor signal | Oxygen sensor 1 (behind catalytic converter) |
| 17 | Not used | |||
| 18 | E | A_LSH2 | Sensor signal | Oxygen sensor 2 (behind catalytic converter) |
| 19 | M | T_LHH2 | Oxygen sensor heating ground | Oxygen sensor 2 (behind catalytic converter) |
| 20 | M | M_LSV1 | Signal ground | Oxygen sensor 1 (in front of catalytic converter) |
| 21 | M | M_LSV2 | Signal ground | Oxygen sensor 2 (in front of catalytic converter) |
| 22 | M | M_LSH1 | Signal ground | Oxygen sensor 1 (behind catalytic converter) |
| 23 | A | S_HR | Activate relay | Engine control module relay |
| 24 | M | M_LSH2 | Signal ground | Oxygen sensor 2 (behind catalytic converter) |
X60003 (Pin 1–4)
| Pin | Type | Signal | Description/Function | Connection |
| 1 | E | A_HFM | Signal air mass meter | Hot film air mass meter |
| 2 | E | P_NWGA1 | Signal camshaft position | Camshaft position sensor 2 (outlet) |
| 3 | Not used | |||
| 4 | A | U_DKFW1 | Voltage supply | Throttle position sensor 1 |
| Pin | Type | Signal | Description/Function | Connection |
| 5 | E | P_NWGE1 | Signal camshaft position | Camshaft position sensor 1 (inlet) |
| 6 | Not used | |||
| 7 | A | U_DKFW2 | Voltage supply | Throttle position sensor 2 |
| 8 | E | P_KWG | Signal crankshaft position | Crankshaft position sensor |
| 9 | E | A_FWG2 | Throttle position signal | Throttle position sensor 2 |
| 10 | E | A_DKG2 | Throttle position signal | Throttle position sensor 2 |
| 11 | Not used | |||
| 12 | E | S_30H | Start signal | Starter |
| 13 | E | S_61-1 | Charging signal | Generator |
| 14 | M | M_DKFW1 | Ground | Throttle position sensor 1 |
| 15 | M | M_NWGA1 | Ground | Camshaft position sensor 2 (outlet) |
| 16 | E | A_FWG1 | Throttle position signal | Throttle position sensor 1 |
| 17 | M | M_HFM | Ground | Hot film air massmeter |
| 18 | M | M_NWGE1 | Ground | Crankshaft position sensor 1 (inlet) |
| 19 | E | A_DKG1 | Throttle position signal | Throttle position sensor 1 |
| 20 | M | M_DKFW2 | Ground | Throttle position sensor 2 |
| 21 | M | M_KWG | Ground | Crankshaft position sensor |
| 22 | E | A_TANS | Temperature signal | Intake air temperature sensor |
| 23 | M | M_TANS | Ground | Intake air temperature sensor |
| 24 | E | A_TMOT | Temperature signal | Engine coolant temperature sensor |
| 25 | M | M_TMOT | Ground | Engine coolant temperature sensor |
| 26 | E | A_OLD | Pressure signal | Oil pressure switch |
| 27 | E | A_TQEL | Temperature signal | Oil temperature sensor |
| 28 | M | M_TQEL | Ground | Oil temperature sensor |
| 29 | E | A_KS1A | Cyl. 1-3 knock sensor | Knock sensor |
| 30 | E | A_KS1B | Cyl. 1-3 knock sensor | Knock sensor |
| 31 | E | A_KS2A | Cyl. 4-6 knock sensor | Knock sensor |
| 32 | E | A_KS2B | Cyl. 4-6 knock sensor | Knock sensor |
| 33 | A | P_EVZ1 | Activate valve | Cyl. 1 fuel injection valve |
| 34 | A | P_EVZ2 | Activate valve | Cyl. 2 fuel injection valve |
| 35 | A | P_EVZ3 | Activate valve | Cyl. 3 fuel injection valve |
| 36 | A | P_EVZ4 | Activate valve | Cyl. 4 fuel injection valve |
| Pin | Type | Signal | Description/Function | Connection |
| 37 | A | P_EVZ5 | Activate valve | Cyl. 5 fuel injection valve |
| 38 | A | P_EVZ6 | Activate valve | Cyl. 6 fuel injection valve |
| 39 | E | F_OLN | Level signal | Oil level sensor |
| 40 | A | T_NWE1 | Activate valve | Variable camshaft control valve 1 (inlet) |
| 41 | A | T_NWA1 | Activate valve | Variable camshaft control valve 2 (outlet) |
| 42 | A | T_TEV | Activate valve | Evaporative emission valve |
| 43 | A | T_MDK1 | Activate motor | Cruise control actuator |
| 44 | A | T_MDK2 | Activate motor | Cruise control actuator |
| 45 | A | S_KFK | Cooling signal | Thermostat, characteristic map cooling |
| 46 | A | T_LLFSS | CLOSE signal | Idle speed control valve |
| 47 | A | T_LLFSO | OPEN signal | Idle speed control valve |
| 48 | M | W_KS | Ground | Shield knock sensor |
| 49 | A | S_DISA | Activate valve | Valve, individual control intake system |
| 50 | Not used | |||
| 51 | Not used | |||
| 52 | A | S_SLPV | Activate valve | Secondary air pump valve |
E = Input
A = Output
M = Ground
X60004
| Pin | Type | Signal | Description/Function | Connection |
| 1 | A | 61 | Charging signal | Instrument cluster |
| 2 | A | 30H | Start signal | Body electronics control module (ZKE IV) |
| 3 | A | S_SLP | Activate relay | Secondary air pump relay |
| 4 | Not used | |||
| 5 | Not used | |||
| 6 | Not used | |||
| 7 | Not used | |||
| 8 | Not used |
| Pin | Type | Signal | Description/Function | Connection |
| 9 | Not used | |||
| 10 | A | EKP | Activate relay | Fuel pump relay |
| 11 | A | OELD | Oil pressure signal | Instrument cluster |
| 12 | Not used | |||
| 13 | Not used | |||
| 14 | Not used | |||
| 15 | Not used | |||
| 16 | Not used | |||
| 17 | A | TD | Crankshaft RPM speed signal TD | Instrument cluster |
| 18 | Not used | |||
| 19 | E | RFL | Reverse signal | Reversing light switch/ Automatic transmission range switch |
| 20 | Not used | |||
| 21 | A | A-OELN | Oil level signal | Thermal oil level sensor (TOENS) control module |
| 22 | E | DFAHR | Speed signal right rear | ABS/ASC control module |
| 23 | E | KUPP | Clutch signal | Clutch switch |
| 24 | E | KL 54 ON | Brake signal | Brake light switch |
| 25 | Not used | |||
| 26 | E | 15A26 | Terminal 15 | Fuse 26 |
| 27 | E | MFL | Cruise control signal | Cruise control interface |
| 28 | E | S_BLTS | Brake signal | Brake light switch |
| 29 | A | S_KOREL | Activate relay | Compressor control relay |
| 30 | A | LDPV | Activate valve | Leakage diagnosis pump |
| 31 | Not used | |||
| 32 | E/A | TXDII | TXD diagnosis data link | Data link connector |
| 33 | E | S_DWA | Drive-away protection signal (code) | Electronic immobilizer control module (EWS III) |
| 34 | E | LDPS | Leakage signal | Leakage diagnosis pump |
| 35 | M | 31 | Ground | Cruise control interface |
| 36 | E/A | CAN+ | CAN bus high | Instrument cluster, ABS/ASC control module |
| Pin | Type | Signal | Description/Function | Connection |
| 37 | E/A | CAN- | CAN bus low | Instrument cluster, ABS/ASC control module |
| 38 | Not used | |||
| 39 | Not used | |||
| 40 | Not used |
X60005
| Pin | Type | Signal | Description/Function | Connection |
| 1 | A | P_ZSZ3 | Ignition coil signal | Cyl. 3 ignition coil |
| 2 | A | P_ZSZ2 | Ignition coil signal | Cyl. 2 ignition coil |
| 3 | A | P_ZSZ1 | Ignition coil signal | Cyl. 1 ignition coil |
| 4 | Not used | |||
| 5 | M | 31L | Ground | Ground point |
| 6 | M | A_ZSR | Ground | Ground point |
| 7 | A | P_ZSZ6 | Ignition coil signal | Cyl. 6 ignition coil |
| 8 | A | P_ZSZ5 | Ignition coil signal | Cyl. 5 ignition coil |
| 9 | A | P_ZSZ4 | Ignition coil signal | Cyl. 4 ignition coil |